Properties

Label 261.2.g.c
Level $261$
Weight $2$
Character orbit 261.g
Analytic conductor $2.084$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $4$

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Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [261,2,Mod(17,261)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(261, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([2, 3]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("261.17");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 261 = 3^{2} \cdot 29 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 261.g (of order \(4\), degree \(2\), minimal)

Newform invariants

comment: select newform
 
sage: f = N[0] # Warning: the index may be different
 
gp: f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(2.08409549276\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: 8.0.1871773696.1
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} + 31x^{4} + 81 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{4}]$

$q$-expansion

comment: q-expansion
 
sage: f.q_expansion() # note that sage often uses an isomorphic number field
 
gp: mfcoefs(f, 20)
 

Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta_1 q^{2} + (\beta_{5} + 2 \beta_{3}) q^{4} + ( - \beta_{7} - \beta_{6} + \cdots + \beta_1) q^{5}+ \cdots - 3 \beta_{7} q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q + \beta_1 q^{2} + (\beta_{5} + 2 \beta_{3}) q^{4} + ( - \beta_{7} - \beta_{6} + \cdots + \beta_1) q^{5}+ \cdots - 6 \beta_1 q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 8 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 8 q^{7} + 24 q^{10} + 12 q^{16} - 20 q^{19} + 16 q^{25} - 4 q^{31} - 4 q^{37} + 12 q^{40} - 8 q^{43} + 44 q^{46} - 48 q^{49} - 36 q^{52} - 60 q^{55} - 20 q^{58} - 36 q^{61} - 24 q^{70} + 52 q^{73} - 4 q^{76} + 4 q^{79} + 8 q^{82} + 20 q^{85} - 48 q^{88} + 116 q^{94} + 28 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} + 31x^{4} + 81 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( \nu^{5} + 19\nu ) / 21 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( \nu^{6} + 40\nu^{2} ) / 63 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( \nu^{4} + 12 ) / 7 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -4\nu^{6} - 97\nu^{2} ) / 63 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( \nu^{7} + 40\nu^{3} ) / 63 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( 4\nu^{7} + 97\nu^{3} ) / 189 \) Copy content Toggle raw display
\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{5} + 4\beta_{3} \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( -3\beta_{7} + 4\beta_{6} \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( 7\beta_{4} - 12 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( 21\beta_{2} - 19\beta_1 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( -40\beta_{5} - 97\beta_{3} \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( 120\beta_{7} - 97\beta_{6} \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/261\mathbb{Z}\right)^\times\).

\(n\) \(118\) \(146\)
\(\chi(n)\) \(-\beta_{3}\) \(-1\)

Embeddings

For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.

For more information on an embedded modular form you can click on its label.

comment: embeddings in the coefficient field
 
gp: mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
17.1
−1.62831 1.62831i
−0.921201 0.921201i
0.921201 + 0.921201i
1.62831 + 1.62831i
−1.62831 + 1.62831i
−0.921201 + 0.921201i
0.921201 0.921201i
1.62831 1.62831i
−1.62831 1.62831i 0 3.30278i −1.84240 0 −1.00000 2.12132 2.12132i 0 3.00000 + 3.00000i
17.2 −0.921201 0.921201i 0 0.302776i −3.25662 0 −1.00000 −2.12132 + 2.12132i 0 3.00000 + 3.00000i
17.3 0.921201 + 0.921201i 0 0.302776i 3.25662 0 −1.00000 2.12132 2.12132i 0 3.00000 + 3.00000i
17.4 1.62831 + 1.62831i 0 3.30278i 1.84240 0 −1.00000 −2.12132 + 2.12132i 0 3.00000 + 3.00000i
215.1 −1.62831 + 1.62831i 0 3.30278i −1.84240 0 −1.00000 2.12132 + 2.12132i 0 3.00000 3.00000i
215.2 −0.921201 + 0.921201i 0 0.302776i −3.25662 0 −1.00000 −2.12132 2.12132i 0 3.00000 3.00000i
215.3 0.921201 0.921201i 0 0.302776i 3.25662 0 −1.00000 2.12132 + 2.12132i 0 3.00000 3.00000i
215.4 1.62831 1.62831i 0 3.30278i 1.84240 0 −1.00000 −2.12132 2.12132i 0 3.00000 3.00000i
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 17.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
29.c odd 4 1 inner
87.f even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 261.2.g.c 8
3.b odd 2 1 inner 261.2.g.c 8
29.c odd 4 1 inner 261.2.g.c 8
87.f even 4 1 inner 261.2.g.c 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
261.2.g.c 8 1.a even 1 1 trivial
261.2.g.c 8 3.b odd 2 1 inner
261.2.g.c 8 29.c odd 4 1 inner
261.2.g.c 8 87.f even 4 1 inner

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{2}^{8} + 31T_{2}^{4} + 81 \) acting on \(S_{2}^{\mathrm{new}}(261, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} + 31T^{4} + 81 \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( (T^{4} - 14 T^{2} + 36)^{2} \) Copy content Toggle raw display
$7$ \( (T + 1)^{8} \) Copy content Toggle raw display
$11$ \( T^{8} + 994T^{4} + 6561 \) Copy content Toggle raw display
$13$ \( (T^{2} + 9)^{4} \) Copy content Toggle raw display
$17$ \( (T^{4} + 625)^{2} \) Copy content Toggle raw display
$19$ \( (T^{4} + 10 T^{3} + \cdots + 36)^{2} \) Copy content Toggle raw display
$23$ \( (T^{4} + 94 T^{2} + 1156)^{2} \) Copy content Toggle raw display
$29$ \( (T^{4} + 40 T^{2} + 841)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 2 T^{3} + \cdots + 3364)^{2} \) Copy content Toggle raw display
$37$ \( (T^{4} + 2 T^{3} + \cdots + 3364)^{2} \) Copy content Toggle raw display
$41$ \( (T^{4} + 16)^{2} \) Copy content Toggle raw display
$43$ \( (T^{4} + 4 T^{3} + \cdots + 576)^{2} \) Copy content Toggle raw display
$47$ \( T^{8} + 11186 T^{4} + 3418801 \) Copy content Toggle raw display
$53$ \( (T^{4} + 22 T^{2} + 4)^{2} \) Copy content Toggle raw display
$59$ \( (T^{2} + 2)^{4} \) Copy content Toggle raw display
$61$ \( (T^{4} + 18 T^{3} + \cdots + 1156)^{2} \) Copy content Toggle raw display
$67$ \( (T^{4} + 154 T^{2} + 2601)^{2} \) Copy content Toggle raw display
$71$ \( (T^{4} - 62 T^{2} + 324)^{2} \) Copy content Toggle raw display
$73$ \( (T^{4} - 26 T^{3} + \cdots + 6084)^{2} \) Copy content Toggle raw display
$79$ \( (T^{4} - 2 T^{3} + \cdots + 26244)^{2} \) Copy content Toggle raw display
$83$ \( (T^{2} + 26)^{4} \) Copy content Toggle raw display
$89$ \( T^{8} + 6034 T^{4} + 6765201 \) Copy content Toggle raw display
$97$ \( (T^{4} - 14 T^{3} + \cdots + 324)^{2} \) Copy content Toggle raw display
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